William t



(ModeL) W. T. TERRY & E. A. DYKE.

Burglar Alarm. No.- 228,954. Patented June15,1880.

I N-PETEHS, PHOTO-'LITHOGRAPINER, WASHINGTON. D. C.

UNITED STATES PATENT Orrrcnt WILLIAM T. TERRY AND ELIJAH A. DYKE, OF NORTH ADAMS, MASS.

BU-RGLA SPECIFICATION forming part of Letters Patent No. 228,954, dated June 15, 1880.

Application filed March 30, 1880.

To all whom it may concern:

Be it known that we, WILLIAM T. TERRY and ELIJAH A. DYKE, both of North Adams, in the county of Berkshire and State of M assachusetts, have invented certain new and useful Improvements in Burglar-Alarms, whereof the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a front view of our improved alarm, the cover having been removed, taken when in the operation of sounding the bell. Fig. 2 is a sectional view of the wing, taken through the plane in which the pins thereof operate, and shows also the wing and fastening pins. Fig. 3 shows the thumb-catch. Fig. 4 shows the device, on a reduced scale, attach ed to a door by screws inside the case.

A is the case containing the device; B, the bell; O, the wing; and D D, the hammers attached to the levers E E, to which are attached the springs F F, which drive said hammers against the bell when the levers are operated by andreleased from the wing-pins G G G H is a thumb-catch, which being given a quarter-turn sets the levers E E and holds them rigidly beyond the reach of the wing-pins when it is desired to prevent the operation of the alarm, the edges h h entering the notches a a, and being held there by the pressure of the springs F F until turned out by superior force on the thumb-catch. I I are the pivots on which the levers operate, and K is a stop against which the levers abut to keep the hammers from actual contact with the bell except when the spring of the arms to which they are attached is overcome momentarily to allow them'to strike the bell, and which also holds the levers in position to be operated by the wing-pins.

In the wing 0 holes are drilled as sockets to hold the wing-pins, which are held from being driven out of said holes by the pins 0 c 0 which work in the notches d (1 d of said wing-pins, allowing them to play back and forth in their sockets within necessary limits when actuated by the springs e e c, which are placed in the bottom of their sockets, driving said wing-pins outward.

N is a cylindrical piece in which the spindle of the door lock or latch passes when the device is in place.

(Modeh) To fit the alarm to a door the wing must be adjusted to the spindle in the position in which one or more of the wing-pins will take into one or the other of the levers E or E at the time the wing in the door lock or latch is turned either way to retract the latch from its pocket in the striker, so that the bell will surely be struck before the latch is fully retracted. It is usual to have the spindle-holes in looks and latches uniformly arranged relatively to the lock-spindles, so that the device will be operated when the spindle operates the wing against the lock or latch bolt if the socket M is set as shown in Fig. l; but if the lock or latch wing is differently arranged on its spindle the part N must be correspondingly changed in position.

After part N is adjusted a notch is cut or hole drilled into it, and a pimp, is firmly embedded into or against it in the wing 0, holdingit firmly in place. The pin 1) may beascrew and its socket tapped to hold it in place, so that it may be easily changed for different doors by cutting several notches or holes in part N.

b b are inclined planes on the levers, against which the wing-pins impinge and by which they are driven in, so that they may pass each lever in one direction, and after passing either 'are driven out again by their springs in position to operate either lever as they are turned one way or the other. The direction in which the wing-pins may pass is different for each lever, and therefore no wing-pin can pass both levers nor project between the levers and be turned out in either direction with'out ringing the bell.

The springs e c c are delicately made, and the planes b b so favorably inclined that the wing-pins do not interferewith the spring of the latch or look, which therefore replaces the wing in position to operate the alarm after each retraction of the bolt; but if this is not considered sufficient studs may be put in each side of the wing, limiting its motion to what is necessary, and bent springs easily adjusted thereby to drive the wing into position to engage the levers. By thus limiting the wings motion the knob may be controlled, so that the bolt cannot be projected enough to catch in its-striker without pulling at least one pin in position to strike the hell if turned. Additional wing-pins may be added by enlarging wing G, if it is desired to give many strokes of the bell in turning the wing to retract the bolt.

The case is made so thin that it may be attached to nearly every door by using the additional length of spindle which generally projects into knob-shanks on doors and using the additional screw-holes usually left for adjustment. At most only a new spindle can be required. The thumb catch H detaches the alarm from the knob whenever desired.

The operation of the device is sufficiently obvious. Plainly, when adjusted as described the knob cannot be turned either way to operate the latch or look without sharply ringing the bell.

With further allowance of room in the case the wing may be made cylindrical with wing-pins about its entire periphery, in which case the care necessary to its arrangement relatively to the wing actuating the door-bolt will be obviated. Also, if the alarm is attached to a door with the bell downward, the wing-pins will operate by gravity and their springs may be dispensed with.

We are aware that sundry devices have been patented in which the levers E E have been made longer or shorter by sliding or hinged extensions arranged to allow the wing to pass one or both of them in one direction, but to take into and operate them in the direction necessary for ringing the bell; but these devices can only be applied to the door in one position and provide for only one stroke of the bell.

We are aware that alarm-bells have been operated by the use of spring-bolts connected with and operated in hearings in pivoted rocking levers attached to and operated by supplementary door-bolts thrown by the knob to bolt the door when tampered with, all which devices we disclaim. a

What we claim as our invention, and that for which we pray Letters Patent, is-

1. The wing 0 upon the actuating-spindle of a door-latch, combined with one or more of the wing-pins G G located and operated in bearings in said wing and pressed outward by one or more of the springs 0 6 and combined also with the pivoted levers E E, carrying bellhammers D D, and having the inclined surfaces b I), each of which levers is attached to a spring, E or F, all said parts being combined with'the stop K and bell B, and arranged and operated as described.

2. The thumb-catch H, combined with the pivoted levers E E, having notches a a, or their equivalents, and attached to the hammers D D, the springs F F, attached to the levers and stationary t'astenings, as described, the wing 0, having one or more of the wing-pins G G G and the bell B, all arranged and operatin g as described.

WILLIAM T. TERRY. ELIJAH A. DYKE.

In presence of S. E. PARKER, M. GATSLICK. 

